NSDate *now = [NSDate date];

NSCalendar *calendar = [NSCalendar currentCalendar];

NSDateComponents *comp = [calendar components:NSYearCalendarUnit|NSMonthCalendarUnit|NSDayCalendarUnit|NSWeekdayCalendarUnit|NSDayCalendarUnit

                                       fromDate:now];

// 得到星期几

// 1(星期天) 2(星期二) 3(星期三) 4(星期四) 5(星期五) 6(星期六) 7(星期天)

NSInteger weekDay = [comp weekday];

// 得到几号

NSInteger day = [comp day];

NSLog(@"weekDay:%ld   day:%ld",weekDay,day);

// 计算当前日期和这周的星期一和星期天差的天数

long firstDiff,lastDiff;

if (weekDay == ) {

    firstDiff = ;

    lastDiff = ;

}else{

    firstDiff = [calendar firstWeekday] - weekDay;

    lastDiff =  - weekDay;

}

NSLog(@"firstDiff:%ld   lastDiff:%ld",firstDiff,lastDiff);

// 在当前日期(去掉了时分秒)基础上加上差的天数

NSDateComponents *firstDayComp = [calendar components:NSYearCalendarUnit|NSMonthCalendarUnit|NSDayCalendarUnit fromDate:now];

[firstDayComp setDay:day + firstDiff];

NSDate *firstDayOfWeek= [calendar dateFromComponents:firstDayComp];

NSDateComponents *lastDayComp = [calendar components:NSYearCalendarUnit|NSMonthCalendarUnit|NSDayCalendarUnit fromDate:now];

[lastDayComp setDay:day + lastDiff];

NSDate *lastDayOfWeek= [calendar dateFromComponents:lastDayComp];

NSDateFormatter *formater = [[NSDateFormatter alloc] init];

[formater setDateFormat:@"yyyy-MM-dd HH:mm:ss"];

NSLog(@"星期一开始 %@",[formater stringFromDate:firstDayOfWeek]);

NSLog(@"当前 %@",[formater stringFromDate:now]);

NSLog(@"星期天结束 %@",[formater stringFromDate:lastDayOfWeek]);